Display substrate and driving method therefor

Abstract

Disclosed are a display substrate and a driving method therefor, relating to the technical field of display. The display substrate comprises: a backplane, and a first functional unit and a second functional unit located on one side of the backplane. The display substrate can perform picture display by means of the second functional unit in a second state, and the display substrate can further detect target light by means of the first functional unit in a first state. In this way, it can be ensured that the display substrate has a display function, and also has the function of detecting the target light, thereby effectively enriching the function of the display substrate.

Description

Display substrate and driving method thereof Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display substrate and a driving method thereof. Background Art

[0002] With the development of display technology, LED chips have become the most advantageous new generation display media due to their advantages such as pure color, wide dynamic range, high brightness, high definition, low operating voltage, low power consumption, long life, impact resistance, wide viewing angle and stable and reliable operation. Therefore, display substrates integrated with LED chips have become the most advantageous new generation display media and have been widely used.

[0003] Summary of the Invention

[0004] The present invention provides a display substrate and a driving method thereof. The technical solution is as follows:

[0005] In one aspect, a display substrate is provided, comprising:

[0006] Back panel;

[0007] a first functional unit and a second functional unit located on one side of the backplane, wherein the first functional unit has a first state and the second functional unit has a second state;

[0008] The first functional unit and the second functional unit both comprise a first semiconductor layer, a multi-quantum well layer, and a second semiconductor layer that are stacked;

[0009] Wherein, when the first functional unit is in the first state, the first functional unit is used to detect target light; when the second functional unit is in the second state, the second functional unit emits light outward.

[0010] Optionally, the first functional unit further has the second state; wherein, when the first functional unit is in the second state, the first functional unit emits light outward.

[0011] Optionally, the first functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0012] The first state is a state in which the potential applied to the anode is smaller than the potential applied to the cathode, and the second state is a state in which the potential applied to the anode is larger than the potential applied to the cathode.

[0013] Optionally, the second functional unit further has the first state, and when the second functional unit is in the first state, the second functional unit is used to detect the target light;

[0014] The second functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0015] The first state is a state in which the potential applied to the anode is smaller than the potential applied to the cathode, and the second state is a state in which the potential applied to the anode is larger than the potential applied to the cathode.

[0016] Optionally, the backplane includes a driving circuit layer; the driving circuit layer includes: a first driving circuit electrically connected to the first functional unit;

[0017] The first driving circuit is used to control the first functional unit to be in the first state or the second state.

[0018] Optionally, the first driving circuit includes: a writing subcircuit, a storage subcircuit, a driving transistor, and a detection subcircuit; the first functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0019] The write sub-circuit is connected to the first control signal line, the data signal line and the first node respectively, and the data write sub-circuit is used to output a state control signal from the data signal line to the first node in response to a first control signal provided by the first control signal line;

[0020] The storage subcircuit is connected to the first node and the second node respectively, and the storage subcircuit is used to adjust the potential of the second node according to the potential of the first node, and the second node is connected to the anode of the first functional unit;

[0021] The gate of the driving transistor is connected to the first node, the first electrode of the driving transistor is connected to the first power signal line, and the second electrode of the driving transistor is connected to the second node;

[0022] The detection sub-circuit is respectively connected to the first power signal line, the second node and the detection signal line;

[0023] In which, the state control signal is used to control the driving transistor to be in an on state or an off state; when the driving transistor is in the off state, under the control of the detection sub-circuit and the detection signal line, the first functional unit is in the first state; when the driving transistor is in the on state, under the control of the first power signal line, the first functional unit is in the second state.

[0024] Optionally, the detection subcircuit includes: a first detection subcircuit, a second detection subcircuit and a read transistor;

[0025] The first detection sub-circuit is connected to the second control signal line, the second node, and the third node respectively, the third node is connected to the detection signal line, and the first detection sub-circuit is configured to output a reverse bias signal from the detection signal line to the second node in response to a second control signal provided by the second control signal line;

[0026] The gate of the read transistor is connected to the fourth node, the first electrode of the read transistor is connected to the first power signal line, and the fourth node is connected to the second electrode of the drive transistor and the third node respectively;

[0027] The second detection sub-circuit is respectively connected to the third control signal line, the third node and the second electrode of the read transistor, and the second detection sub-circuit is used to output a test signal provided by the first power signal line and passing through the first electrode and the second electrode of the read transistor to the third node in response to a third control signal provided by the third control signal line.

[0028] Optionally, the first detection subcircuit includes: a first transistor;

[0029] A gate of the first transistor is connected to the second control signal line, a first electrode of the first transistor is connected to the second node, and a second electrode of the first transistor is connected to the third node.

[0030] Optionally, the second detection subcircuit includes: a second transistor;

[0031] A gate of the second transistor is connected to the third control signal line, a first electrode of the second transistor is connected to the third node, and a second electrode of the second transistor is connected to the second electrode of the read transistor.

[0032] Optionally, the writing sub-circuit includes: a third transistor;

[0033] A gate of the third transistor is connected to the first control signal line, a first electrode of the third transistor is connected to the data signal line, and a second electrode of the third transistor is connected to the first node.

[0034] Optionally, the storage sub-circuit includes: a first capacitor;

[0035] One end of the first capacitor is connected to the first node, and the other end of the first capacitor is connected to the second node.

[0036] Optionally, the driving circuit layer further includes a second driving circuit electrically connected to the second functional unit, the second driving circuit being used to control the second functional unit to be in the second state; the second functional unit includes an anode and a cathode arranged opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0037] The second driving circuit includes: a fourth transistor, a second storage capacitor and a fifth transistor;

[0038] The gate of the fourth transistor is connected to the first control signal line, the first electrode of the fourth transistor is electrically connected to the data signal line, and the second electrode of the fourth transistor is connected to the fifth node;

[0039] One end of the second capacitor is connected to the fifth node, the other end of the second capacitor is connected to the sixth node, and the sixth node is connected to the anode of the second functional unit;

[0040] A gate of the fifth transistor is connected to the fifth node, a first electrode of the fifth transistor is connected to the first power signal line, and a second electrode of the fifth transistor is connected to the sixth node.

[0041] Optionally, the plurality of first driving circuits and the plurality of second driving circuits in the backplane are arranged in an array; the backplane further comprises: a plurality of data signal lines, a plurality of first control signal lines, a plurality of second control signal lines, a plurality of third control signal lines, and a plurality of detection signal lines; the data signal lines and the detection signal lines are arranged in parallel, the first control signal lines, the second control signal lines, and the third control signal lines are arranged in parallel, and an extension direction of the data signal lines intersects an extension direction of the first control signal lines;

[0042] Among them, the same data signal line is electrically connected to the first drive circuit and / or the second drive circuit arranged in a column; the same first control signal line is electrically connected to the first drive circuit and / or the second drive circuit arranged in a row; the same second control signal line and the same third control signal line are both electrically connected to the first drive circuits arranged in a row; the same detection signal line is electrically connected to the first drive circuits arranged in a column.

[0043] Optionally, the second functional unit further has the first state, and when the second functional unit is in the first state, the second functional unit is used to detect the target light;

[0044] The driving circuit layer further includes a second driving circuit electrically connected to the second functional unit, and the second driving circuit is used to control the second functional unit to be in the first state or the second state.

[0045] Optionally, the plurality of first driving circuits and the plurality of second driving circuits in the backplane are arranged in an array; the backplane further comprises: a plurality of data signal lines, a plurality of first control signal lines, a plurality of second control signal lines, a plurality of third control signal lines, and a plurality of detection signal lines; the data signal lines and the detection signal lines are arranged in parallel, the first control signal lines, the second control signal lines, and the third control signal lines are arranged in parallel, and an extension direction of the data signal lines intersects an extension direction of the first control signal lines;

[0046] In which, the same data signal line and the same detection signal line are electrically connected to the first drive circuit and / or the second drive circuit arranged in a column; the same first control signal line, the same second control signal line and the same third control signal line are electrically connected to the first drive circuit and / or the second drive circuit arranged in a row.

[0047] Optionally, the first functional unit and the second functional unit each include an anode and a cathode disposed opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0048] The backplane also includes: a first power signal line and a second power signal line, the anode of the first functional unit and the anode of the second functional unit are both electrically connected to the first power signal line, and the cathode of the first functional unit and the cathode of the second functional unit are both electrically connected to the second power signal line.

[0049] Optionally, the plurality of the first functional units and the plurality of the second functional units are arranged in an array into multiple rows and multiple columns;

[0050] The first functional unit and the second functional unit each include an anode and a cathode disposed opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0051] The backplane includes: a plurality of first detection lines, a plurality of second detection lines, a plurality of first driving lines and a plurality of second driving lines;

[0052] One of the first detection lines is electrically connected to the anodes of each first functional unit in a row of the first functional units, and one of the second detection line is electrically connected to the cathodes of each first functional unit in a column of the first functional units;

[0053] One first driving line is electrically connected to the anode of each second functional unit in a row of the second functional units, and one second driving line is electrically connected to the cathode of each second functional unit in a column of the second functional units.

[0054] Optionally, the extension direction of the first detection line is parallel to the extension direction of the first driving line, and the first detection line and the first driving line are arranged in the same layer; the extension direction of the second detection line is parallel to the extension direction of the second driving line, and the second detection line and the second driving line are arranged in the same layer.

[0055] Optionally, the plurality of the first functional units and the plurality of the second functional units are arranged in an array into multiple rows and multiple columns;

[0056] The first functional unit and the second functional unit each include an anode and a cathode disposed opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer;

[0057] The backplane includes: a plurality of first detection lines, a plurality of second detection lines, a plurality of first driving lines and a plurality of second driving lines;

[0058] One of the first detection lines is electrically connected to the anodes of each first functional unit in a column of the first functional units, and one of the second detection lines is electrically connected to the cathodes of each first functional unit in a row of the first functional units;

[0059] One first driving line is electrically connected to the anode of each second functional unit in a row of the second functional units, and one second driving line is electrically connected to the cathode of each second functional unit in a column of the second functional units.

[0060] Optionally, the extension direction of the first detection line is parallel to the extension direction of the second driving line, and the first detection line and the second driving line are arranged in the same layer; the extension direction of the second detection line is parallel to the extension direction of the first driving line, and the second detection line and the first driving line are arranged in the same layer.

[0061] Optionally, multiple columns of the first functional units and multiple columns of the second functional units are arranged alternately, and / or,

[0062] A plurality of rows of the first functional units and a plurality of rows of the second functional units are arranged alternately.

[0063] Optionally, the target light is a portion of the light emitted by the second functional unit in the second state.

[0064] Optionally, the target light is light reflected back by an external object among the light emitted by the second functional unit in the second state, and / or,

[0065] The target light is a light with a large viewing angle among the lights emitted by the second functional unit in the second state.

[0066] Optionally, the target light is light reflected back by an external object in the light emitted by the second functional unit in the second state, and the external object includes a fingerprint.

[0067] Optionally, at least part of the multi-quantum well layer in the second functional unit is used to emit light of the first color, and a material of the multi-quantum well layer in the first functional unit is the same as a material of the multi-quantum well layer in the second functional unit that emits light of the first color;

[0068] Alternatively, at least part of the multi-quantum well layer in the second functional unit is used to emit light of a second color, and the material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits light of the first color or light of the second color;

[0069] Alternatively, at least part of the multi-quantum well layer in the second functional unit is used to emit a third color light, and the material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits the first color light, the second color light, or the third color light;

[0070] The wavelength of the first color light is greater than the wavelength of the second color light, and the wavelength of the second color light is greater than the wavelength of the third color light.

[0071] Optionally, the target light is light incident from the outside.

[0072] Optionally, the light incident from the outside includes: external ambient light and / or laser.

[0073] Optionally, the material of the multi-quantum well layer in the first functional unit is the multi-quantum well material in a red light emitting diode.

[0074] Optionally, the second functional unit includes a second functional unit that emits red light when in the second state;

[0075] The material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits red light when in the second state.

[0076] Optionally, the first functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer; the display substrate includes a plurality of the first functional units, and the plurality of the first functional units are divided into at least one group of first functional units;

[0077] The display substrate further includes: at least one first applying electrode corresponding one-to-one to the at least one group of first functional units, and at least one second applying electrode corresponding one-to-one to the at least one group of first functional units;

[0078] In a group of the first functional units, the anode of each of the first functional units is used to be connected to a corresponding first application electrode, and the cathode of each of the first functional units is used to be connected to a corresponding second application electrode.

[0079] Optionally, a group of the first functional units can be arranged in at least two rows;

[0080] The first applying electrode includes: a first electrode body, and at least two first strip electrodes corresponding one-to-one to at least two rows of the first functional units, wherein ends of the first strip electrodes are connected to the first electrode body, and the first strip electrodes are connected to the anodes of the respective first functional units in the corresponding row of the first functional units;

[0081] The second applying electrode includes: a second electrode body, and at least two second strip electrodes corresponding one-to-one to at least two rows of the first functional units, ends of the second strip electrodes are connected to the second electrode body, and the second strip electrodes are connected to the cathodes of the first functional units in the corresponding row of the first functional units;

[0082] The at least two first strip electrodes and the at least two second strip electrodes are distributed between the first electrode body and the second electrode body, and the at least two first strip electrodes and the at least two second strip electrodes are arranged alternately.

[0083] In another aspect, a method for driving a display substrate is provided. The method is applied to the above-mentioned display substrate, and the method includes:

[0084] In a first stage, the potential of the first control signal provided by the first control signal line and the potential of the second control signal provided by the second control signal line are both the first potential, the potential of the third control signal provided by the third control signal line is the second potential, the potential of the state control signal provided by the data signal line and the potential of the reverse bias signal provided by the detection signal line are both the second potential, the write sub-circuit outputs the state control signal to the first node in response to the first control signal, so that the drive transistor is in the off state, and the first detection sub-circuit outputs the reverse bias signal to the second node in response to the second control signal, so that the first functional unit is in the first state;

[0085] In the second stage, the potential of the first control signal provided by the first control signal line and the potential of the third control signal provided by the third control signal line are both the first potential, the potential of the second control signal provided by the second control signal line is the second potential, and the potential of the state control signal provided by the data signal line is the second potential; the write sub-circuit outputs the state control signal to the first node in response to the first control signal, so that the drive transistor is in the off state; and the second detection sub-circuit outputs the test signal provided by the first power signal line and passing through the first electrode and the second electrode of the read transistor to the detection signal line through the third node in response to the third control signal;

[0086] In the third stage, the potential of the first control signal provided by the first control signal line is the first potential, the potential of the second control signal provided by the second control signal line and the potential of the third control signal provided by the third control signal line are both the second potential, the potential of the state control signal provided by the data signal line is the first potential, and the write sub-circuit outputs the state control signal to the first node in response to the first control signal, so that the driving transistor is in the on state, and the first power signal line outputs the first power signal to the fourth node through the driving transistor, so that the first functional unit is in the second state.

[0087] In another aspect, a method for driving a display substrate is provided. The method is applied to the above-mentioned display substrate, and the method includes:

[0088] During the stage in which the display substrate detects the target light, detection drive signals are applied to the multiple second detection lines in sequence, and in the process of applying the detection drive signal to any one of the second detection lines, the detection signals transmitted by the multiple first detection signal lines are obtained to determine the position of the first functional unit that receives the target light and the intensity of the target light irradiated to the first functional unit.

[0089] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0090] A display substrate includes a backplane, and a first functional unit and a second functional unit located on one side of the backplane. The display substrate can not only display images using the second functional unit in its second state, but can also detect target light using the first functional unit in its first state. This ensures that the display substrate not only has a display function but also has the function of detecting target light, effectively enriching the functionality of the display substrate. Furthermore, for a terminal device incorporating this display substrate, there is no need to include a dedicated optical sensor for detecting target light, effectively simplifying the terminal device's internal structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0092] FIG1 is a top view of a display substrate provided in an embodiment of the present application;

[0093] FIG2 is a schematic diagram of a film structure of a functional unit in a display substrate provided in an embodiment of the present application;

[0094] FIG3 is a top view of a driving circuit layer provided in an embodiment of the present application;

[0095] FIG4 is a block diagram of a first driving circuit provided in an embodiment of the present application;

[0096] FIG5 is a block diagram of another first driving circuit provided in an embodiment of the present application;

[0097] FIG6 is a timing diagram of various signals in a first driving circuit provided in an embodiment of the present application;

[0098] FIG7 is a block diagram of a second driving circuit provided in an embodiment of the present application;

[0099] FIG8 is a schematic diagram showing the distribution of a first driving circuit and a second driving circuit in a backplane provided by an embodiment of the present application;

[0100] 9 is a schematic diagram showing the distribution of a first driving circuit and a second driving circuit in another backplane provided by an embodiment of the present application;

[0101] FIG10 is a schematic diagram showing the connection between a first functional unit and a second functional unit in a display substrate provided in an embodiment of the present application;

[0102] 11 is a timing diagram of a display substrate providing a plurality of second detection lines applying detection drive signals according to an embodiment of the present application;

[0103] 12 is a timing diagram of a display substrate providing a plurality of first detection lines applying a first driving signal according to an embodiment of the present application;

[0104] 13 is a schematic diagram showing the connection between a first functional unit and a second functional unit in another display substrate provided by an embodiment of the present application;

[0105] FIG14 is a distribution diagram of a group of first functional units provided in an embodiment of the present application. DETAILED DESCRIPTION

[0106] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0107] Please refer to Figure 1, which is a top view of a display substrate provided by an embodiment of the present application. The display substrate 000 may include: a backplane 100, and a first functional unit 200 and a second functional unit 300 located on one side of the backplane 100.

[0108] Here, the number of the first functional units 200 and the number of the second functional units 300 in the display substrate 000 may both be plural, and the plurality of first functional units 200 and the plurality of second functional units 300 may both be arranged in an array on the back plate 100 .

[0109] In the present application, as shown in FIG2 , which is a schematic diagram of the film layer structure of a functional unit in a display substrate provided in an embodiment of the present application, the first functional unit 200 and the second functional unit 300 in the display substrate 000 may both include a stacked first semiconductor layer 001, a multi-quantum well layer 002, and a second semiconductor layer 003. One of the first semiconductor layer 001 and the second semiconductor layer 003 may be P-type doped gallium nitride, and the other of the first semiconductor layer 001 and the second semiconductor layer 003 may be N-type doped gallium nitride.

[0110] Optionally, the first functional unit 200 and the second functional unit 300 in the display substrate 000 also include an anode 004 and a cathode 005 that are disposed opposite each other. Specifically, when the first semiconductor layer 001 is P-type doped gallium nitride and the second semiconductor layer 003 is N-type doped gallium nitride, the anode 004 can be located on a layer of the first semiconductor layer 001 away from the multi-quantum well layer 002, and the cathode 005 can be located on a side of the second semiconductor layer 003 away from the multi-quantum well layer 002.

[0111] To this end, the first functional unit 200 and the second functional unit 300 in the display substrate 000 can both be LED chips. Here, the LED chip can be a regular-sized LED chip, a mini-LED chip, or a micro-LED chip. This embodiment of the present application does not limit this.

[0112] In the embodiment of the present application, the first functional unit 200 in the display substrate 000 may have a first state, and the second functional unit 300 in the display substrate 000 may have a second state.

[0113] When the first functional unit 200 is in the first state, the first functional unit 200 is used to detect the target light; when the second functional unit 300 is in the second state, the second functional unit 300 is used to emit light outward.

[0114] It should be noted that the first functional unit 200 in the display substrate 000 having a first state can be understood as: the first functional unit 200 only has the first state or the first functional unit 200 can also have other states other than the first state (for example, the second state); similarly, the second functional unit 300 in the display substrate 000 having a second state can be understood as: the second functional unit 300 only has the second state or the second functional unit 300 can also have other states other than the second state (for example, the first state).

[0115] In the present application, both the first functional unit 200 and the second functional unit 300 can be electrically connected to the backplane 100. The backplane 100 in the display substrate 000 can provide a corresponding drive control signal to the first functional unit 200, so that the first functional unit 200 is in a first state capable of detecting target light. The backplane 100 in the display substrate 000 can also provide a corresponding drive control signal to the second functional unit 300, so that the second functional unit 300 is in a second state capable of emitting light outward, so that the display substrate 000 can display the corresponding display image.

[0116] In summary, the display substrate provided in the embodiment of the present application includes: a backplane, and a first functional unit and a second functional unit located on one side of the backplane. The display substrate can not only display the image through the second functional unit in the second state, but also detect the target light through the first functional unit in the first state. In this way, it can be ensured that the display substrate not only has a display function, but also has a function of detecting the target light, which effectively enriches the functions of the display substrate. In addition, for a terminal device that integrates such a display substrate, there is no need to set a light sensor specifically for detecting the target light in the terminal device, which can effectively simplify the internal structure of the terminal device.

[0117] In an embodiment of the present application, the backplane 100 in the display substrate 000 can use an AM driving method to apply a driving control signal to the first functional unit 200 and the second functional unit 300, or can use a PM driving method to apply a driving control signal to the first functional unit 200 and the second functional unit 300.

[0118] Here, when the backplane 100 uses a PM drive method to apply control signals to the first functional unit 200 and the second functional unit 300, under the drive control of the backplane 100, the first functional unit 200 in the display substrate 000 can only be in the first state for detecting target light, and the second functional unit 300 in the display substrate 000 can only be in the second state for emitting light. In other words, the first functional units 200 in the display substrate 000 can only detect target light and do not emit light; the second functional units 300 in the display substrate 000 can only emit light and do not detect target light.

[0119] When the backplane 100 applies control signals to the first functional unit 200 and the second functional unit 300 using an AM drive method, under the drive control of the backplane 100, the first functional unit 200 in the display substrate 000 can not only be in the first state for detecting target light, but also in the second state for emitting light outward. Similarly, the second functional unit 300 in the display substrate 000 can not only be in the second state for emitting light outward, but also in the first state for detecting target light.

[0120] For example, for a backplane 100 in a display substrate 000 that uses an AM drive mode, in one possible implementation, the first functional unit 200 in the display substrate 000 can be in both the first state and the second state, and the second functional unit 300 in the display substrate 000 can also be in both the first state and the second state. In another possible implementation, the first functional unit 200 in the display substrate 000 can be in both the first state and the second state, while the second functional unit 300 in the display substrate 000 can only be in the second state. This embodiment of the present application is not limited to this.

[0121] In the above embodiment, the first state refers to the state in which the potential applied to the anode in the functional unit is less than the potential applied to the cathode; the second state refers to the state in which the potential applied to the anode in the functional unit is greater than the potential applied to the cathode.

[0122] For example, for a first functional unit 200 that can be in both the first state and the second state, when the potential applied to the anode in the first functional unit 200 is less than the potential applied to the cathode in the first functional unit 200, the first functional unit 200 can be in the first state, enabling the first functional unit 200 to detect target light. When the potential applied to the anode in the first functional unit 200 is greater than the potential applied to the cathode in the first functional unit 200, the first functional unit 200 can be in the second state, enabling the second functional unit 300 to emit light.

[0123] Similarly, for the second functional unit 300 that can be in both the first state and the second state, when the potential applied to the anode in the second functional unit 300 is lower than the potential applied to the cathode in the second functional unit 300, the second functional unit 300 can be in the first state, enabling the second functional unit 300 to detect target light. When the potential applied to the anode in the second functional unit 300 is higher than the potential applied to the cathode in the second functional unit 300, the second functional unit 300 can be in the second state, enabling the second functional unit 300 to emit light.

[0124] The following embodiments will schematically illustrate the internal structure and driving principle of the backplane 100 using an AM driving mode and the internal structure and driving principle of the backplane 100 using a PM driving mode.

[0125] In a first exemplary implementation, when the backplane 100 adopts an AM drive mode, the backplane 100 may include a drive circuit layer. As shown in FIG3 , which is a top view of a drive circuit layer provided in an embodiment of the present application, the drive circuit layer in the backplane 100 may include: a first drive circuit 101 electrically connected to the first functional unit 200. The first drive circuit 101 may be used to control the first functional unit 200 to be in the first state or the second state.

[0126] In an embodiment of the present application, as shown in Figure 4, Figure 4 is a block diagram of a first driving circuit provided in an embodiment of the present application. The first driving circuit 101 in the backplane 100 may include: a writing sub-circuit 1011, a storage sub-circuit 1012, a driving transistor M1 and a detection sub-circuit 1013.

[0127] The write sub-circuit 1011 in the first driving circuit 101 can be connected to the first control signal line G1, the data signal line D, and the first node N1, respectively. The write sub-circuit 1011 can be configured to output a state control signal from the data signal line D to the first node N1 in response to a first control signal provided by the first control signal line G1.

[0128] The storage sub-circuit 1012 in the first driver circuit 101 can be connected to the first node N1 and the second node N2, respectively. Here, the second node N2 can be connected to the anode of the first functional unit 200, and the cathode of the first functional unit 200 can be connected to the second power signal line VSS. The storage sub-circuit 1012 can be used to adjust the potential of the second node N2 according to the potential of the first node N1.

[0129] The driving transistor M1 in the first driving circuit 101 may have a gate, a first electrode, and a second electrode. It should be noted that, in the driving transistor M1, one of the first electrode and the second electrode may be a source electrode, and the other may be a drain electrode, as in various types of transistors in the following embodiments. The gate of the driving transistor M1 may be connected to the first node N1, the first electrode of the driving transistor M1 may be connected to the first power signal line VDD, and the second electrode of the driving transistor M0 may be connected to the second node N2.

[0130] The detection sub-circuit 1013 in the first driving circuit 101 may be connected to the first power signal line VDD, the second node N2 and the detection signal line SL, respectively.

[0131] In the present application, after the write sub-circuit 1011 responds to the first control signal provided by the first control signal line G1 to output the state control signal from the data signal line D to the first node N1, the state control signal can be transmitted to the gate of the driving transistor M1 through the first node N1, thereby allowing the state control signal to control the driving transistor M1 to be in the on state or the off state. For example, when the potential of the state control signal is the first potential, the driving transistor M1 can be in the on state, that is, the first electrode and the second electrode of the driving transistor M1 can be conductive; when the potential of the state control signal is the second potential, the driving transistor M1 can be in the off state, that is, the first electrode and the second electrode of the driving transistor M1 are disconnected. It should be noted that the first potential here and the first potential in the following embodiments are both effective potentials, and the second potential here and the second potential in the following embodiments are both invalid potentials, and the second potential can be a lower potential relative to the first potential, that is, the first potential can be higher than the second potential.

[0132] Here, when the driving transistor M1 is in the off state, under the control of the detection sub-circuit 1013 and the detection signal line SL, the first functional unit 200 can be in the first state; when the driving transistor M1 is in the on state, under the control of the first power signal line VDD, the first functional unit 200 can be in the second state.

[0133] For example, the potential of the first power signal transmitted on the first power signal line VDD may be greater than the potential of the second power signal transmitted on the second power signal line VSS, and the first power signal line VDD may be electrically connected to the anode of the second functional unit 300 via the driving transistor M1 and the second node N2, and the second power signal line VSS may be electrically connected to the cathode of the second functional unit 300. In this case, when the driving transistor M1 is in the on state, the first power signal applied to the first power signal line VDD may be transmitted to the anode of the first functional unit 200 via the driving transistor M1 and the second node N2, so that the potential of the anode of the first functional unit 200 may be greater than the potential of the cathode of the first functional unit 200, thereby allowing the first functional unit 200 to be in the second state.

[0134] When the driving transistor M1 is in the off state, the first power signal applied to the first power signal line VDD will not be transmitted to the anode of the first functional unit 200 through the driving transistor M1 and the second node N2. The detection signal line SL can transmit a reverse bias signal to the anode of the first functional unit 200 through the detection sub-circuit 1013 and the second node N2. The potential of the reverse polarization signal is less than the potential of the second power signal, so that the potential of the anode of the first functional unit 200 can be less than the potential of the cathode of the first functional unit 200, thereby enabling the first functional unit 200 to be in the first state.

[0135] Optionally, as shown in FIG5 , which is a block diagram of another first driving circuit provided in an embodiment of the present application, the detection subcircuit 1013 in the first driving circuit 101 may include: a first detection subcircuit 10131 , a second detection subcircuit 10132 and a read transistor M2 .

[0136] The first detection sub-circuit 10131 in the detection sub-circuit 1013 can be connected to the second control signal line G2, the second node N2, and the third node N3, respectively. Here, the third node N3 can be connected to the detection signal line SL. The first detection sub-circuit 10131 can be configured to output a reverse bias signal from the detection signal line SL to the second node N2 in response to the second control signal provided by the second control signal line G2. The potential of the reverse bias signal can be lower than the potential of the second power signal provided by the second power signal line VSS.

[0137] The read transistor M2 in the detection sub-circuit 1013 may have a gate, a first electrode, and a second electrode. The gate of the read transistor M2 may be connected to a fourth node N4, and the first electrode of the read transistor M2 may be connected to the first power supply signal line VDD. The fourth node N4 may be connected to the second electrode and the third node N3 of the drive transistor M1, respectively.

[0138] The second detection sub-circuit 10132 in the detection sub-circuit 1013 can be connected to the third control signal line G3, the third node N3, and the second electrode of the read transistor M2, respectively. The second detection sub-circuit 10132 is configured to output a test signal, provided from the first power supply signal line VDD and passing through the first and second electrodes of the read transistor M2, to the third node N3 in response to a third signal line provided by the third control signal line G3.

[0139] For example, after the detection signal line SL applies a reverse bias signal to the anode of the first functional unit 200 via the first detection sub-circuit 10131 and the second node N2, the potential of the anode of the first functional unit 200 can be lower than the potential of the cathode of the first functional unit 200, and the first functional unit 200 is in the first state. In this case, the intensity of the target light irradiating the first functional unit 200 is correlated with the potential of the signal applied by the anode of the first functional unit 200 to the gate of the read transistor M2 via the second node N2 and the fourth node N4. That is, different intensities of the target light irradiating the first functional unit 200 result in different potentials of the signal applied by the anode of the first functional unit 200 to the gate of the read transistor M2, thereby varying the degree of conduction between the first and second electrodes of the read transistor M2. Consequently, the potential of the test signal transmitted from the first power supply signal line VDD to the detection signal line SL via the first and second electrodes of the read transistor M2 also varies. Therefore, by detecting the potential of the detection signal transmitted by the detection signal line SL, the intensity of the target light irradiating the first functional unit 200 can be determined.

[0140] Optionally, the first detection sub-circuit 10131 in the first drive circuit 101 may include a first transistor M3. The first transistor M3 may have a gate, a first electrode, and a second electrode. The gate of the first transistor M3 may be connected to the second control signal line G2, the first electrode of the first transistor M3 may be connected to the second node N2, and the second electrode of the first transistor M3 may be connected to the third node N3.

[0141] Optionally, the second detection sub-circuit 10132 in the first drive circuit 101 may include a second transistor M4. The second transistor M4 may have a gate, a first electrode, and a second electrode. The gate of the second transistor M4 may be connected to the third control signal line G3, the first electrode of the second transistor M4 may be connected to the third node N3, and the second electrode of the second transistor M4 may be connected to the second electrode of the read transistor M2.

[0142] Optionally, the write sub-circuit 1011 in the first drive circuit 101 may include a third transistor M5. The third transistor M5 may have a gate, a first electrode, and a second electrode. The gate of the third transistor M5 may be connected to the first control signal line G1, the first electrode of the third transistor M5 may be connected to the data signal line D, and the second electrode of the third transistor M5 may be connected to the first node N1.

[0143] Optionally, the storage sub-circuit 1012 in the first driving circuit 101 may include: a first capacitor Cst1 . One end of the first capacitor Cst1 may be connected to the first node N1 , and the other end of the first capacitor Cst1 may be connected to the second node N2 .

[0144] Optionally, in the first driving circuit 101, the driving transistor M1, the first transistor M3, the second transistor M4, and the third transistor M5 may all be N-type switching transistors, and the reading transistor M2 may be a P-type switching transistor. Here, the P-type switching transistor is turned on when the potential on the gate is the second potential and is turned off when the potential on the gate is the first potential; the N-type switching transistor is turned on when the potential on the gate is the first potential and is turned off when the potential on the gate is the second potential.

[0145] In the embodiment of the present application, the driving method of the first driving circuit 101 in the display substrate 000 may include the following steps:

[0146] Step S101, in the first stage, the potential of the first control signal provided by the first control signal line and the potential of the second control signal provided by the second control signal line are both the first potential, the potential of the third control signal provided by the third control signal line is the second potential, the potential of the state control signal provided by the data signal line and the potential of the reverse bias signal provided by the detection signal line are both the second potential, the write sub-circuit responds to the first control signal, outputs the state control signal to the first node, so that the driving transistor is in the off state, and the first detection sub-circuit responds to the second control signal, outputs the reverse bias signal to the second node, so that the first functional unit is in the first state.

[0147] Step S102, the second stage, the potential of the first control signal provided by the first control signal line and the potential of the third control signal provided by the third control signal line are both the first potential, the potential of the second control signal provided by the second control signal line is the second potential, the potential of the state control signal provided by the data signal line is the second potential, the write sub-circuit responds to the first control signal, outputs the state control signal to the first node, so that the driving transistor is in the off state, and the second detection sub-circuit responds to the third control signal, outputs the test signal provided from the first power signal line and passing through the first and second poles of the read transistor to the detection signal line through the third node.

[0148] Step S103, the third stage, the potential of the first control signal provided by the first control signal line is the first potential, the potential of the second control signal provided by the second control signal line and the potential of the third control signal provided by the third control signal line are both the second potential, the potential of the state control signal provided by the data signal line is the first potential, the write sub-circuit responds to the first control signal, outputs the state control signal to the first node, so that the driving transistor is in the on state, and the first power signal line outputs the first power signal to the fourth node through the driving transistor, so that the first functional unit is in the second state.

[0149] By way of example, taking the first driving circuit shown in FIG5 as an example, and taking the example that the driving transistor M1, the first transistor M3, the second transistor M4 and the third transistor M5 can all be N-type switching transistors, the reading transistor M2 can be a P-type switching transistor, and the first potential is a high potential relative to the second potential (that is, the first potential is greater than the second potential), the driving principle of the first driving circuit provided in an embodiment of the present application is described in detail.

[0150] Figure 6 is a timing diagram of various signals in a first drive circuit provided in an embodiment of the present application. As shown in Figure 6, in the first stage T1, the potential of the first control signal provided by the first control signal line G1 and the potential of the second control signal provided by the second control signal line G2 are both the first potential. The potential of the third control signal provided by the third control signal line G3 is the second potential. For example, the potential of the first control signal and the potential of the second control signal are both positive, and the potential of the third control signal is negative, so that the third transistor M5 and the first transistor M3 are both turned on, and the second transistor M4 is turned off.

[0151] After the third transistor M5 is turned on, the data signal line D can output a state control signal to the first node N1 through the third transistor M5. In the first phase T1, the potential of the state control signal provided by the data signal line D is a second potential, which can be a negative potential, so that the driving transistor M1 can be in the off state.

[0152] After the first transistor M3 is turned on and the second transistor M4 is turned off, the detection signal line SL can output a reverse bias signal to the second node N2 via the first transistor M3. During the first phase T1, the reverse bias signal provided by the detection signal line SL is a second potential, which can be a negative potential that is less than the potential of the first power signal provided by the second power signal line VSS to the cathode of the first functional unit 200. Therefore, after the reverse bias signal is transmitted to the anode of the first functional unit 200 via the second node N2, the first functional unit 200 is placed in the first state, enabling it to detect the intensity of the target light.

[0153] In the second phase T2, the potential of the first control signal provided by the first control signal line G1 and the potential of the third control signal provided by the third control signal line G3 are both the first potential. The potential of the second control signal provided by the second control signal line G2 is the second potential. For example, the potential of the first control signal and the potential of the third control signal are both positive, and the potential of the second control signal is negative, so that the third transistor M5 and the second transistor M4 are both turned on, and the first transistor M3 is turned off.

[0154] Thus, after the third transistor M5 is turned on, the data signal line D can output a state control signal to the first node N1 via the third transistor M5. Furthermore, in the second phase T2, the potential of the state control signal provided by the data signal line D is a second potential, which can be a negative potential, so that the driving transistor M1 can be in an off state.

[0155] Furthermore, after the first functional unit 200 is in the first state, the intensity of the target light irradiating the first functional unit 200 is correlated with the potential of the signal applied by the anode of the first functional unit 200 to the gate of the read transistor M2, sequentially through the second node N2 and the fourth node N4. That is, different intensities of the target light irradiating the first functional unit 200 result in different potentials of the signal applied by the anode of the first functional unit 200 to the gate of the read transistor M2, thereby varying the degree of conduction between the first and second electrodes of the read transistor M2. Consequently, after the second transistor M4 is turned on and the first transistor M3 is turned off, the potential of the test signal transmitted from the first power signal line VDD to the detection signal line SL, via the first and second electrodes of the read transistor M2, also varies. Therefore, by detecting the potential of the detection signal transmitted by the detection signal line SL, the intensity of the target light irradiating the first functional unit 200 can be determined.

[0156] In the third stage T3, the potential of the first control signal provided by the first control signal line G1 is the first potential, and the potential of the second control signal provided by the second control signal line G2 and the potential of the third control signal provided by the third control signal line G3 are both the second potential. For example, the potential of the first control signal is positive, and the potentials of the second control signal and the third control signal are both negative, so that the third transistor M is turned on, and the first transistor M3 and the second transistor M4 are both turned off.

[0157] Thus, after the third transistor M5 is turned on, the data signal line D can output a state control signal to the first node N1 via the third transistor M5. Furthermore, during the third phase T3, the potential of the state control signal provided by the data signal line D is a first potential, which can be a positive potential, causing the driving transistor M1 to be in a conductive state. Thus, the first power signal line VDD can sequentially transmit the first power signal to the anode of the first functional unit 200 via the first and second electrodes of the driving transistor M1, the fourth node N4, and the second node N2. Because the potential of the first power signal provided by the first power signal line VDD is higher than the potential of the second power signal provided by the second power signal line VSS, in this case, the first functional unit 200 can be in the second state, enabling the first functional unit 200 to emit light. It should be noted that the potential of the state control signal provided by the data signal line D in the third stage T3 is the first potential, which means that the potential of the state control signal is any potential higher than the second potential. In this way, the data signal line D can provide first potentials with different potentials in the third stage T3, so that the degree of opening of the driving transistor M1 is different, and thus the voltage difference between the anode and cathode of the first functional unit 200 is different, so as to ensure that the first functional unit 200 can emit light of different brightness to achieve grayscale display.

[0158] In an embodiment of the present application, as shown in FIG3 , when the backplane 100 adopts an AM drive mode, the drive circuit layer in the display substrate 000 may further include: a second drive circuit 102 connected to the second functional unit 300. Driven by the second drive circuit 102, the second functional unit 300 may be in a second state for emitting light outward only, or in a first state for detecting target light in addition to the second state for emitting light outward. To this end, the present embodiment will be illustrated using the following two possible scenarios as examples.

[0159] In the first possible scenario, only the second functional unit 300 is driven to the second state by the second driving circuit 102, as shown in Figure 7, which is a block diagram of a second driving circuit provided in an embodiment of the present application. Here, the second driving circuit 102 can be used to control the second functional unit 300 to be in the second state. Exemplarily, the second driving circuit 102 may include: a fourth transistor M6, a second storage capacitor Cst2, and a fifth transistor M7.

[0160] The fourth transistor M6 in the second driving circuit 102 may have a gate, a first electrode, and a second electrode. The gate of the fourth transistor M6 may be connected to the first control signal line G1, the first electrode of the fourth transistor M6 may be connected to the data signal line D, and the second electrode of the fourth transistor M6 may be connected to the fifth node N5.

[0161] One end of the second capacitor Cst2 in the second driving circuit 102 can be connected to the fifth node N5, and the other end of the second capacitor Cst2 can be connected to the sixth node N6. The sixth node N6 can be connected to the anode of the second functional unit 300, and the cathode of the second functional unit 300 can be connected to the second power signal line VSS. The storage sub-circuit 1012 can be used to adjust the potential of the second node N2 according to the potential of the first node N1.

[0162] The fifth transistor M7 in the second driving circuit 102 may have a gate, a first electrode, and a second electrode. The gate of the fifth transistor M7 may be connected to the fifth node N5, the first electrode of the fifth transistor M7 may be connected to the first power signal line VDD, and the second electrode of the fifth transistor M7 may be connected to the sixth node N6.

[0163] In this case, after the fourth transistor M6 responds to the first control signal provided by the first control signal line G1 to output the state control signal from the data signal line D to the fourth node N4, the state control signal can be transmitted to the gate of the fifth transistor M7 through the fourth node N4, so that the state control signal can control the fifth transistor M7 to be in the on state or the off state.

[0164] For example, when the potential of the state control signal is the first potential, the fifth transistor M7 can be in an on state, that is, the first and second electrodes of the fifth transistor M7 can be conductive. In this way, the first power signal line VDD can sequentially transmit the first power signal to the anode of the second functional unit 300 through the first and second electrodes of the fifth transistor M7 and the fifth node N5. Because the potential of the first power signal provided by the first power signal line VDD is higher than the potential of the second power signal provided by the second power signal line VSS, in this case, the second functional unit 300 can be in the second state, allowing the first functional unit 200 to emit light. When the potential of the state control signal is the first potential, the fifth transistor M7 can be in an off state, that is, the first and second electrodes of the fifth transistor M7 are disconnected. In this way, the first power signal provided by the first power signal line VDD is no longer applied to the anode of the second functional unit 300, and the second functional unit 300 can be in a non-luminous state.

[0165] It should be noted that the second driving circuit 102 in Figure 7 may include two transistors and a storage capacitor, and the second driving circuit 102 may also be referred to as a 2T1C circuit. Similarly, the first driving circuit 101 in Figure 5 may include five transistors and a storage circuit, and the first driving circuit 101 may also be referred to as a 5T1C circuit. In the case where two layers of the driving circuit in the backplane 100 include both 2T1C circuits and 5T1C circuits, these 2T1C circuits and 5T1C circuits may share some signal lines. For example, these 2T1C circuits and 5T1C circuits may share the first control signal line G1 and the data signal line D.

[0166] For example, please refer to Figure 8, which is a schematic diagram of the distribution of the first drive circuit and the second drive circuit in a backplane provided in an embodiment of the present application. The multiple first drive circuits 101 and the multiple second drive circuits 102 in the backplane 100 can be arranged in an array. Here, the backplane 100 can also include: multiple data signal lines D, multiple first control signal lines G1, multiple second control signal lines G2, multiple third control signal lines G3 and multiple detection signal lines SL. Among these signal lines, the data signal line D and the detection signal line SL can be arranged in parallel, the first control signal line G1, the second control signal line G2 and the third control signal line G3 can be arranged in parallel, and the extension direction of the data signal line D can intersect with the extension direction of the first control signal line G1. For example, the extension direction of the data signal line D2 is perpendicular to the extension direction of the first control signal line G1.

[0167] In one possible implementation, the data signal lines D and the detection signal lines SL in the backplane 100 are arranged in the same layer and made of the same material. The first control signal lines G1, the second control signal lines G2, and the third control signal lines G3 in the backplane 100 are arranged in the same layer and made of the same material. To this end, the data signal lines D and the detection signal lines SL in the backplane 100 can be formed simultaneously through the same patterning process; the first control signal lines G1, the second control signal lines G2, and the third control signal lines G3 in the backplane 100 can be formed simultaneously through the same patterning process. In this way, the difficulty of manufacturing the backplane 100 can be effectively reduced.

[0168] In the present application, the same data signal line D can be electrically connected to the first driving circuits 101 and / or the second driving circuits 102 arranged in a column. For example, when all the driving circuits in a column of the backplane 100 are first driving circuits 101, the corresponding data signal line D can be respectively connected to the first electrode of the third transistor M5 in each of the first driving circuits 101 in the column of driving circuits; when all the driving circuits in a column of the backplane 100 are second driving circuits 102, the corresponding data signal line D can be respectively connected to the first electrode of the fourth transistor M6 in each of the second driving circuits 102 in the column of driving circuits; when part of the driving circuits in a column of the backplane 100 are first driving circuits 101 and the other part of the driving circuits are second driving circuits 102, the corresponding data signal line D can be respectively connected to the first electrode of the third transistor M5 in each of the first driving circuits 101 in the column of driving circuits, and the first electrode of the fourth transistor M6 in each of the second driving circuits 102. To this end, the first driving circuits 101 and / or the second driving circuits 102 arranged in a column may be connected together via a data signal D.

[0169] The same first control signal line G1 can be electrically connected to the first driving circuits 101 and / or the second driving circuits 102 arranged in a row. For example, when all the driving circuits in a row of the backplane 100 are first driving circuits 101, a corresponding first control signal line G1 can be respectively connected to the gate of the third transistor M5 in each of the first driving circuits 101 in the row of driving circuits; when all the driving circuits in a row of the backplane 100 are second driving circuits 102, a corresponding first control signal line G1 can be respectively connected to the gate of the fourth transistor M6 in each of the second driving circuits 102 in the row of driving circuits; when part of the driving circuits in a row of the backplane 100 are first driving circuits 101 and the other part of the driving circuits are second driving circuits 102, a corresponding first control signal line G1 can be respectively connected to the first electrode of the third transistor M5 in each of the first driving circuits 101 and the first electrode of the fourth transistor M6 in each of the second driving circuits 102 in the row of driving circuits. To this end, the first driving circuits 101 and / or the second driving circuits 102 arranged in a row may be connected via a first control signal line G1 .

[0170] The same second control signal line G2 and the same third control signal line G3 can both be connected to the first driving circuits 101 arranged in a row. For example, the same second control signal line G2 can connect the gates of the first transistors M3 in the first driving circuits 101 arranged in a row; and the same third control signal line G3 can connect the gates of the second transistors M4 in the first driving circuits 101 arranged in a row.

[0171] The same detection signal line SL is connected to the first driving circuits 101 arranged in a column. For example, the same detection signal line SL can connect the third nodes N3 in the first driving circuits 101 arranged in a column.

[0172] In the second possible scenario, when the second functional unit 300 is driven by the second driving circuit 102, both in the second state and in the first state, the second driving circuit 102 connected to the second functional unit 300 is used to control the second functional unit 300 to be in the first state or in the second state. It should be noted that the structure of the second driving circuit 102 is the same as that of the first driving circuit 101, that is, the second driving circuit 102 also belongs to a 5T1C circuit including five transistors and one storage capacitor. To this end, the driving principle of the second driving circuit 102 can refer to the corresponding content of the first driving circuit 101 above, and will not be repeated here.

[0173] In this case, the first drive circuit 101 and the second drive circuit 102 in the backplane 100 can share signal lines. For example, the first drive circuit 101 and the second drive circuit 102 can share data signal lines D, detection signal lines SL, first control signal lines G1, second control signal lines G2, and third control signal lines G3.

[0174] For example, please refer to Figure 9, which is a schematic diagram of the distribution of the first drive circuit and the second drive circuit in another backplane provided in an embodiment of the present application. The multiple first drive circuits 101 and the multiple second drive circuits 102 in the backplane 100 can be arranged in an array. Here, the backplane 100 can also include: multiple data signal lines D, multiple first control signal lines G1, multiple second control signal lines G2, multiple third control signal lines G3 and multiple detection signal lines SL. Among these signal lines, the data signal line D and the detection signal line SL can be arranged in parallel, the first control signal line G1, the second control signal line G2 and the third control signal line G3 can be arranged in parallel, and the extension direction of the data signal line D can intersect with the extension direction of the first control signal line G1. For example, the extension direction of the data signal line D2 is perpendicular to the extension direction of the first control signal line G1.

[0175] In the present application, the same data signal line D and the same detection signal line SL can be electrically connected to the first driver circuit 101 and / or the second driver circuit 102 arranged in a column. The same first control signal line G1, the same second control signal line G2, and the same third control signal line G3 can be electrically connected to the first driver circuit 101 and / or the second driver circuit 102 arranged in a row.

[0176] In the embodiment of the present application, the anode of the first functional unit 200 and the anode of the second functional unit 300 can both be electrically connected to the first power signal line VDD; the cathode of the first functional unit 200 and the cathode of the second functional unit 300 can both be electrically connected to the second power signal line VSS. For example, the anodes of all first functional units 200 and the anodes of all second functional units 300 in the backplane 100 can be connected to the first power signal line VDD. Here, the anode of each first functional unit 200 can be connected to the first power signal line VDD through its corresponding first drive circuit 101. Similarly, the anode of each second functional unit 300 can be connected to the first power signal line VDD through its corresponding second drive circuit 102. The cathodes of all first functional units 200 and the cathodes of all second functional units 300 in the backplane 100 can be connected to the second power signal line VSS.

[0177] A second exemplary implementation method is that when the backplane 100 adopts a PM driving method, as shown in the figure, FIG10 is a connection diagram of a first functional unit and a second functional unit in a display substrate provided in an embodiment of the present application. The first functional unit 200 and the second functional unit 300 in the display substrate 000 can be arranged into multiple rows and columns. The backplane 100 in the display substrate 000 may include: multiple first detection lines L, multiple second detection lines Q, multiple first driving lines X, and multiple second driving lines Y.

[0178] Among them, a first detection line L can be electrically connected to the anode of each first functional unit 200 in a row of first functional units 200, and a second detection line Q can be electrically connected to the cathode of each first functional unit 200 in a column of first functional units 200. Here, the backplane 100 can put the first functional units 200 in the first state through the cooperation of the first detection line L and the second detection line Q, so that these first functional units 200 can detect the target light.

[0179] A first driving line X is electrically connected to the anodes of each second functional unit 300 in a row of second functional units 300, and a second driving line Y is electrically connected to the cathodes of each second functional unit 300 in a column of second functional units 300. Here, the backplane 100 can operate the first driving line X and the second driving line Y to place the second functional units 300 in the second state, enabling the second functional units 300 to emit light, thereby enabling the display substrate 000 to display the corresponding image.

[0180] In an embodiment of the present application, as shown in FIG10 , the same end of the plurality of first drive lines X in the backplane 100 can be connected to the first output circuit 010, the same end of the plurality of second drive lines Y in the backplane 100 can be connected to the second output circuit 020, the same end of the plurality of second detection lines Q in the backplane 100 can be connected to the third output circuit 030, and the same end of the plurality of first detection signal lines L in the backplane 100 can be connected to the light detection circuit 040. Here, the first output circuit 010 can output a first drive signal to each first drive line X; the second output circuit 020 can output a second drive signal to each second drive line Y; the third output circuit 030 can output a detection drive signal to each second detection line Q; and the light detection circuit 040 can detect the potential of the output signal of each first detection line L to determine the intensity of the target light irradiated on the corresponding first functional unit 200.

[0181] In one possible implementation, the first output circuit 010, the second output circuit 020, the third output circuit 030, and the light detection circuit 040 may all be chips attached to the display substrate 000. Here, the first output circuit 010 and the light detection circuit 040 may generally be attached to the left and right sides of the display substrate 000, and the second output circuit 020 and the third output circuit 030 may generally be attached to the bottom side of the display substrate 000. Furthermore, in other possible scenarios, the second output circuit 020 and the third output circuit 030 may be integrated together, that is, the same chip attached to the bottom side of the display substrate 000 may implement the functions of both the second output circuit 020 and the third output circuit 030.

[0182] It should be noted that a resistor R is further connected to the end of each first detection line L in the backplane 100 that faces the light detection circuit 040, and the end of the resistor R that faces away from the first detection line L can be grounded. To this end, the first detection line L always applies a lower second potential to the anode of the first functional unit 200. When the potential of the detection drive signal transmitted by the second detection line Q connected to the cathode of the first functional unit 200 is the higher first potential, the first functional unit 200 is in the first state.

[0183] When the display substrate 000 detects the target light, the display substrate 000 can sequentially apply detection drive signals to the plurality of second detection lines Q. Furthermore, when the display substrate 000 applies the detection drive signal to any second detection line Q, the display substrate 000 can obtain detection signals transmitted by the plurality of first detection signal lines L, so that the display substrate 000 can determine the position of the first functional unit 200 that receives the target light and the intensity of the target light irradiating the first functional unit 200.

[0184] For example, please refer to FIG11, which is a timing diagram of a display substrate provided in an embodiment of the present application applying a detection drive signal to multiple second detection lines. The display substrate 000 can apply the detection drive signal to the multiple second detection lines Q through the third output circuit 030. The detection drive signal is a column scan signal. That is, the third output circuit 030 can apply the detection drive signal to each second detection line Q in sequence along a direction (e.g., from left to right) according to the distribution of the multiple second detection lines Q. The potential of the detection drive signal can be a first potential with a higher potential. In this way, when the third output circuit 030 applies the detection drive signal to any second detection line Q, all first functional units 200 connected to this second detection line Q are in the first state. It should be noted that when the third output circuit 030 applies the detection drive signal to any second detection line Q, the other second detection lines Q in the backplane 100 are in a high-impedance state. Here, the high-impedance state is also referred to as a suspended state in which no signal is connected. Therefore, when the third output circuit 030 applies a detection drive signal to any second detection line Q, the third output circuit 030 does not transmit any signal to other second detection lines Q to ensure that these other second detection lines Q can be in a high-impedance state.

[0185] It should also be noted that when the first functional unit 200 is in the first state, the light detection circuit 040 reads different potentials of detection signals via the corresponding first detection lines L when the intensity of the target light irradiating the first functional unit 200 varies. Therefore, when the third output circuit 030 applies a detection drive signal to any second detection line Q, the display substrate 000 can read the detection signals transmitted by each first detection signal line L via the light detection circuit 040. By detecting the potentials of these detection signals, it is possible to determine whether each first functional unit 200 connected to the second detection line Q is irradiated by the target light, and the position of the first functional unit 200 within the column of first functional units 200 that is irradiated by the target light, as well as the intensity of the target light.

[0186] When the display substrate 000 is displaying an image, the display substrate 000 can sequentially apply a first drive signal to a plurality of first drive lines X, and sequentially apply a second drive signal to a plurality of second drive lines Y. Here, for any second functional unit 300 in the display substrate 000, when the potential of the first drive signal applied to the first drive line X connected to the anode of the second functional unit 300 is the first potential, and the potential of the second drive signal applied to the second drive line Y connected to the cathode of the second functional unit 300 is the second potential, the second functional unit 300 can be in the second state capable of emitting light. When the potential of the first driving signal applied to the first driving line X connected to the anode of the second functional unit 300 and the potential of the second driving signal applied to the second driving line Y connected to the cathode of the second functional unit 300 are both the first potential, or when the potential of the first driving signal applied to the first driving line X connected to the anode of the second functional unit 300 and the potential of the second driving signal applied to the second driving line Y connected to the cathode of the second functional unit 300 are both the second potential, the second functional unit 300 can be in a state of not emitting light.

[0187] For example, please refer to FIG12 , which is a timing diagram illustrating a display substrate according to an embodiment of the present application applying a first drive signal to a plurality of first detection lines. The display substrate 000 can simultaneously apply the first drive signal, which is a row scan signal, to the plurality of first drive lines X via the first output circuit 010. That is, the timing at which the first output circuit 010 transmits the first drive signal having a first potential to each first drive line X is different. The first output circuit 010 can sequentially transmit the first drive signal having a first potential to each first drive line X in a direction (e.g., from top to bottom) according to the distribution of the plurality of first drive lines X. In this way, when the first output circuit 010 applies a first drive signal having a first potential to any first drive line X, if a second drive signal having a second potential is applied to a second drive line Y via the second output circuit 020, the second functional unit 300 connected to the first drive line X and the second drive line Y can be in the second state capable of emitting light. If the second output circuit 020 applies a second drive signal having a first potential to the second drive line Y, the second functional unit 300 connected to the first drive line X and the second drive line Y can be in a state where light is stopped.

[0188] It should be noted that, while the first output circuit 010 applies the first driving signal having the first potential to any one of the first driving lines X, the first output circuit 010 may simultaneously apply driving signal lines having the second potential to other first driving lines X. In this way, the second functional units 300 connected to the other first driving lines X may all be in a state of not emitting light.

[0189] Optionally, as shown in FIG10 , within the backplane 100 of the display substrate 000 , the extension direction of the first detection line L can be parallel to the extension direction of the first drive line X, and the first detection line L and the first drive line X can be provided in the same layer and made of the same material; the extension direction of the second detection line Q can be parallel to the extension direction of the second drive line Y, and the second detection line Q and the second drive line Y can be provided in the same layer and made of the same material. To this end, the first detection line L and the first drive line X in the backplane 100 can be formed simultaneously through the same patterning process; the second detection line Q and the second drive line Y in the backplane 100 can also be formed simultaneously through the same patterning process. In this way, the difficulty of manufacturing the backplane 100 can be effectively reduced.

[0190] It should be noted that the above embodiments are schematically illustrated by taking as an example the extension direction of the first detection line L being parallel to the extension direction of the first drive line X, and the extension direction of the second detection line Q being parallel to the extension direction of the second drive line Y. In other possible implementations, as shown in FIG13 , which is a schematic diagram of the connection between first and second functional units within another display substrate provided by an embodiment of the present application, a first drive line X can be connected to the anode of each second functional unit 300 in a row of second functional units 300, a second drive line Y can be connected to the cathode of each second functional unit 300 in a column of second functional units 300, a first detection line L can be connected to the anode of each first functional unit 200 in a column of first functional units 200, and a second detection line Q can be connected to the cathode of each first functional unit 200 in a row of first functional units 200. In this case, the extension direction of the first drive line X is parallel to the extension direction of the second detection line Q, and the first drive line X and the second detection line Q are in the same layer and made of the same material, so that the first drive line X and the second detection line Q can be formed simultaneously through the same patterning process; the extension direction of the second drive line Y is parallel to the extension direction of the first detection line L, and the second drive line Y and the first detection line L are in the same layer and made of the same material, so that the second drive line Y and the first detection line L can be formed simultaneously through the same patterning process.

[0191] It should also be noted that, in the case of FIG. 13 , the first output circuit 010 , the second output circuit 020 , the third output circuit 030 and the light detection circuit 040 bound to the display substrate 000 may be respectively distributed on the four sides of the display substrate 000 .

[0192] In the embodiment of the present application, when the backplane 100 adopts a PM drive mode, multiple columns of first functional units 200 and multiple columns of second functional units 300 in the display substrate 000 can be arranged alternately, and / or multiple rows of first functional units 200 and multiple rows of second functional units 300 in the display substrate 000 can be arranged alternately. In this way, the first functional units 200 and the second functional units 300 in the display substrate 000 can be evenly distributed, ensuring that the display substrate 000 can display images normally, and the entire display area of ​​the display substrate 000 can be used as an area for detecting target light.

[0193] For example, the multiple columns of first functional units 200 and the multiple columns of second functional units 300 in the display substrate 000 can be arranged alternately one by one, that is, a column of second functional units 300 is distributed between every two adjacent columns of first functional units 200, and a column of first functional units 200 is distributed between every two adjacent columns of second functional units 300. Similarly, the multiple rows of first functional units 200 and the multiple rows of second functional units 300 in the display substrate 000 can be arranged alternately one by one, that is, a row of second functional units 300 is distributed between every two adjacent rows of first functional units 200, and a row of first functional units 200 is distributed between every two adjacent rows of second functional units 300.

[0194] For another example, at least two columns of second functional units 300 arranged side by side may be distributed between every two adjacent columns of first functional units 200 in the display substrate 000, or at least two columns of second functional units 300 arranged side by side may be distributed between every two adjacent columns of second functional units 300 in the display substrate 000. Similarly, at least two rows of second functional units 300 arranged side by side may be distributed between every two adjacent rows of first functional units 200 in the display substrate 000, or at least two rows of second functional units 300 arranged side by side may be distributed between every two adjacent rows of second functional units 300 in the display substrate 000.

[0195] In one possible implementation, three columns of second functional units 300 may be arranged side by side between every two adjacent columns of first functional units 200 in the display substrate 000, and these three columns of second functional units 300 are respectively configured to emit red light, green light, and blue light. Alternatively, three rows of second functional units 300 may be arranged side by side between every two adjacent rows of first functional units 200 in the display substrate 000, and these three rows of second functional units 300 are respectively configured to emit red light, green light, and blue light.

[0196] In the embodiment of the present application, regardless of whether the backplane 100 in the display substrate 000 adopts the AM driving method or the PM driving method, after the first functional unit 200 in the display substrate 000 is in the first state, the first functional unit 200 can detect a variety of different types of target light. The embodiment of the present application will use the following two optional implementation methods as examples for schematic explanation.

[0197] In a first optional implementation, after the first functional unit 200 in the display substrate 000 is in the first state, the first functional unit 200 is configured to detect light emitted by the second functional unit 300 in the second state. In this case, the target light detected by the first functional unit 200 in the first state is a portion of the light emitted by the second functional unit 300 in the second state. For example, the target light can be light reflected from an external object within the light emitted by the second functional unit 300 in the second state, and / or the target light can be light with a wide viewing angle within the light emitted by the second functional unit 300 in the second state. Here, the light reflected from an external object can be light reflected from a fingerprint, meaning that the external object can be a fingerprint. Light with a wide viewing angle within the light emitted by the second functional unit 300 in the second state refers to light with a large angle between its emission direction and a direction perpendicular to the display substrate 000 (i.e., the normal direction of the display substrate 000). For example, a light ray with a large viewing angle refers to a light ray whose angle between its emitting direction and the normal direction of the display substrate 000 is greater than 30°. For example, a light ray with a large viewing angle refers to a light ray whose angle between its emitting direction and the normal direction of the display substrate 000 is greater than 40°. For example, a light ray with a large viewing angle refers to a light ray whose angle between its emitting direction and the normal direction of the display substrate 000 is greater than 50°. For example, a light ray with a large viewing angle refers to a light ray whose angle between its emitting direction and the normal direction of the display substrate 000 is greater than 60°. For example, a light ray with a large viewing angle refers to a light ray whose angle between its emitting direction and the normal direction of the display substrate 000 is greater than 70°. For example, a light ray with a large viewing angle refers to a light ray whose angle between its emitting direction and the normal direction of the display substrate 000 is greater than 80°.

[0198] In one scenario, when the target light is light reflected from an external object within the light emitted by the second functional unit 300 in the second state, the display substrate 000 can have a fingerprint detection function. For example, the display area of ​​the display substrate 000 may include a fingerprint detection area, within which the first functional unit 200 and the second functional unit 300 described in the above embodiment may be located. Thus, during fingerprint detection, the backplane 100 of the display substrate 000 can control the second functional unit 300 in the fingerprint detection area to the second state, while simultaneously controlling the first functional unit 200 in the fingerprint detection area to the first state. In this scenario, if a user's finger is positioned at a location corresponding to the fingerprint detection area and the second functional unit 300 in the second state emits light, the light can be directed toward the user's finger. Of these light rays, light directed toward the fingerprint ridges of the user's finger may be absorbed, while light directed toward the fingerprint valleys may be reflected back toward the fingerprint detection area. The first functional unit 200 in the first state within the fingerprint detection area detects these light rays and obtains a fingerprint image of the user's finger.

[0199] In another scenario, when the target light is a wide-angle light emitted by a second functional unit 300 in the second state, the display substrate 000 can perform brightness compensation for functional units with higher temperatures. For example, during the display substrate 000 displaying an image, if the display substrate 000 is at a high temperature, the functional units emitting light from the display substrate 000 will experience brightness attenuation. Here, the first functional units 200 and second functional units 300 in the above-described embodiment are distributed within the display substrate 000. In this way, during the brightness compensation phase of the display substrate 000, the backplane 100 in the display substrate 000 can control the second functional units 300 to be compensated to be in the second state, and control the first functional units 200 distributed adjacent to these second functional units 200 to be compensated to be in the first state. In this case, the wide-angle light in the light emitted by the second functional unit 200 to be compensated can be directed to the first functional unit 200 that is distributed adjacent to it and is in the first state. After detecting the light, the first functional unit 200 can obtain the intensity of the wide-angle light in the light emitted by the second functional unit 200 to be compensated, so that the display substrate can compensate for the brightness of the second functional unit 200 to be compensated based on the detected light intensity.

[0200] In an embodiment of the present application, in order to better enable the first functional unit 200 in the first state to detect the light emitted by the second functional unit 300 in the second state, it is necessary to ensure that the wavelength of the light that can be emitted by the multi-quantum well layer in the first functional unit 200 is greater than or equal to the wavelength of the light emitted by the multi-quantum well layer in the second functional unit 300.

[0201] Exemplarily, at least a portion of the multi-quantum well layers in the second functional unit 300 are configured to emit light of a first color, and the material of the multi-quantum well layers in the first functional unit 200 is the same as the material of the multi-quantum well layers in the second functional unit 300 that emit light of the first color. Alternatively, at least a portion of the multi-quantum well layers in the second functional unit 300 are configured to emit light of a second color, and the material of the multi-quantum well layers in the first functional unit 200 is the same as the material of the multi-quantum well layers in the second functional unit 300 that emit light of the first color or the second color. Alternatively, the multi-quantum well layers in the second functional unit 300 are configured to emit light of a third color, and the material of the multi-quantum well layers in the first functional unit 200 is the same as the material of the multi-quantum well layers in the second functional unit 300 that emit light of the first color, the second color, or the third color.

[0202] The wavelength of the first color light is greater than the wavelength of the second color light, and the wavelength of the second color light is greater than the wavelength of the third color light. For example, the first color light can be red light, the second color light can be green light, and the third color light can be blue light. That is, if the color of the light emitted by the second functional unit 300 is blue light, the first functional unit 200 that can emit red light, green light, or blue light can be used for detection; if the color of the light emitted by the second functional unit 300 is green light, the first functional unit 200 that can emit green light or blue light can be used for detection; if the color of the light emitted by the second functional unit 300 is red light, the first functional unit 200 that can emit red light can be used for detection.

[0203] In a second optional implementation, after the first functional unit 200 in the display substrate 000 is in the first state, the first functional unit 200 is configured to detect light incident from the outside. In this case, the target light detected by the first functional unit 200 in the first state is light incident from the outside. For example, the light incident from the outside may include ambient light and / or laser light.

[0204] In one scenario, when the target light is external ambient light, the display substrate 000 may have the function of detecting the intensity of the ambient light. For example, during the display substrate 000's ambient light detection phase, the backplane 100 in the display substrate 000 may control the first functional unit 200 to be in a first state. In this case, the ambient light incident on the display substrate 000 can be detected by the first functional unit 200, and the first functional unit 200 can detect the intensity of the ambient light. Therefore, in this scenario, the target light is the ambient light incident on the display substrate 000.

[0205] In another scenario, if the target light is a laser, and the laser light is emitted by a laser pen, the display substrate 000 can have the function of detecting the laser pen's irradiation position, and a device equipped with this display substrate 000 can establish a wireless communication connection with the laser pen. For example, during the display substrate 000's detection phase of the laser light emitted by the laser pen, the backplane 100 in the display substrate 000 can control the first functional unit 200 to be in a first state. In this case, after the laser light emitted by the laser pen impinges on the display substrate 000, it can be detected by the first functional unit 200. The display substrate 000 can then determine the position information of the laser pen's irradiation on the display substrate 000 based on the distribution of the first functional unit 200 that detected the laser light, and the display substrate 000 can also display a cursor pattern at the corresponding position. In this way, a user can interact with the device equipped with this display substrate 000 by pressing a button on the laser pen.

[0206] In an embodiment of the present application, when the target light is light incident from the outside, the multi-quantum well layer in the first functional unit 200 can be a light-emitting layer for emitting a first color light, a second color light, or a third color light. The wavelength of the first color light is greater than the wavelength of the second color light, and the wavelength of the second color light is greater than the wavelength of the third color light. For example, the first color light can be red light, the second color light can be green light, and the third color light can be blue light. That is, when the target light is light incident from the outside, the multi-quantum well layer in the first functional unit 200 can emit red light, green light, or blue light.

[0207] It should be noted that in the above two optional implementation methods, the first functional unit capable of emitting red light can detect light of any wavelength. For this reason, in the present application, the material of the multi-quantum well layer in the first functional unit 200 can be the multi-quantum well material in the red light emitting diode.

[0208] It should be noted that when the backplane 100 adopts an AM drive mode, the first functional unit 200 in the display substrate 000 can be a red light-emitting unit for emitting red light. This red light-emitting unit can have a first state and a second state. A portion of the second functional units 300 in the display substrate 000 can be a green light-emitting unit for emitting green light, and another portion of the display substrate 000 can be a blue light-emitting unit for emitting blue light. Both the green light-emitting unit and the blue light-emitting unit have at least a second state. In this case, at least one red light-emitting unit, at least one green light-emitting unit, and at least one blue light-emitting unit in the display substrate 000 constitute a display pixel.

[0209] In this embodiment of the present application, the multiple second functional units 300 in the display substrate 000 may include a second functional unit that emits red light when in the second state. The material of the multi-quantum well layer in the first functional unit 200 within the display substrate 000 may be the same as the multi-quantum well material of the second functional unit that emits red light when in the second state. In this way, the first functional unit 200 can detect light of any wavelength.

[0210] Optionally, the multiple first functional units 200 in the display substrate 000 can be divided into at least one group of first functional units. Please refer to Figure 14, which is a schematic diagram of the distribution of a group of first functional units provided in an embodiment of the present application. Each first functional unit 200 in a group of first functional units can be connected in parallel. Exemplarily, the display substrate 000 may also include: at least one first application electrode 400 corresponding one-to-one to at least one group of first functional units, and at least one second application electrode 500 corresponding one-to-one to at least one group of first functional units.

[0211] In a group of first functional units, the anode of each first functional unit 200 is used to connect to a corresponding first application electrode 400 , and the cathode of each first functional unit 200 is used to connect to a corresponding second application electrode 500 .

[0212] Here, each first functional unit 200 within a corresponding group of first functional units can be simultaneously controlled to be in the first state by the first application electrode 400 and the second application electrode 500. For example, when the potential applied to the first application electrode 400 is less than the potential applied to the second application electrode 500, each first functional unit 200 within the group of first functional units can be in the first state. In this case, by arranging each first functional unit 200 in a group of first functional units side by side, the sensitivity of the first functional unit 200 to the target light can be effectively improved, thereby increasing the accuracy of the target light detection by the group of first functional units 200.

[0213] In the embodiment of the present application, a group of first functional units in the display substrate 000 can be arranged in at least two rows. The first application electrode 400 in the display substrate 000 includes a first electrode body 401 and at least two first strip electrodes 402 corresponding to the at least two rows of first functional units. Here, the end of each first strip electrode 402 can be connected to the first electrode body 401, and each first strip electrode 402 can be connected to the anode of each first functional unit 200 in the corresponding row of first functional units.

[0214] Similarly, the second application electrode 500 may include a second electrode body 501 and at least two second strip electrodes 502 corresponding to at least two rows of first functional units. Here, the end of each second strip electrode 502 may be connected to the second electrode body 501, and each second strip electrode 502 may be connected to the cathode of each first functional unit 200 in the corresponding row of first functional units.

[0215] The at least two first strip electrodes 402 and the at least two second strip electrodes 502 are distributed between the first electrode body 401 and the second electrode body 501, and the at least two first strip electrodes 402 and the at least two second strip electrodes 502 are arranged alternately. For example, the at least two first strip electrodes 402 and the at least two second strip electrodes 502 can be arranged alternately one by one, that is, one second strip electrode 502 can be distributed between two adjacent first strip electrodes 402, and one first strip electrode 402 can be distributed between two adjacent second strip electrodes 502.

[0216] In the present application, the display substrate 000 can transmit the corresponding driving signal to the anode of each first functional unit 200 in a corresponding group of first functional units through at least two first strip electrodes 402 by applying a driving signal to the first electrode body 401 in the first application electrode 400; the display substrate 000 can also transmit the corresponding driving signal to the cathode of each first functional unit 200 in a corresponding group of first functional units through at least two second strip electrodes 502 by applying a driving signal to the second electrode body 501 in the second application electrode 500.

[0217] In summary, the display substrate provided in the embodiment of the present application includes: a backplane, and a first functional unit and a second functional unit located on one side of the backplane. The display substrate can not only display the image through the second functional unit in the second state, but also detect the target light through the first functional unit in the first state. In this way, it can be ensured that the display substrate not only has a display function, but also has a function of detecting the target light, which effectively enriches the functions of the display substrate. In addition, for a terminal device that integrates such a display substrate, there is no need to set a light sensor specifically for detecting the target light in the terminal device, which can effectively simplify the internal structure of the terminal device.

[0218] The embodiment of the present application also provides a display module, which can be any product or component with a display function, such as an advertising screen, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc. The display module may include: a display substrate, and a drive component electrically connected to the display substrate. The display substrate may be the display substrate shown in the above embodiment. The drive component is used to provide a drive control signal to the first functional unit and the second functional unit through the backplane, so that the first functional unit can be in the first state and / or the second functional unit can be in the second state, thereby enabling the display module to not only display the corresponding image, but also detect the target light.

[0219] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0220] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0221] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display substrate, characterized in that: include: Back panel; a first functional unit and a second functional unit located on one side of the backplane, wherein the first functional unit has a first state and the second functional unit has a second state; The first functional unit and the second functional unit both comprise a first semiconductor layer, a multi-quantum well layer, and a second semiconductor layer that are stacked; Wherein, when the first functional unit is in the first state, the first functional unit is used to detect target light; when the second functional unit is in the second state, the second functional unit emits light outward.

2. The display substrate according to claim 1, wherein: The first functional unit also has the second state; wherein, when the first functional unit is in the second state, the first functional unit emits light outward.

3. The display substrate according to claim 2, wherein: The first functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer; The first state is a state in which the potential applied to the anode is smaller than the potential applied to the cathode, and the second state is a state in which the potential applied to the anode is larger than the potential applied to the cathode.

4. The display substrate according to any one of claims 1 to 3, wherein: The second functional unit also has the first state, and when the second functional unit is in the first state, the second functional unit is used to detect the target light; The second functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer; The first state is that the potential applied to the anode is less than the potential applied to the cathode. The second state is a state in which the potential applied to the anode is greater than the potential applied to the cathode.

5. The display substrate according to claim 2, wherein: The backplane includes a driving circuit layer; the driving circuit layer includes: a first driving circuit electrically connected to the first functional unit; The first driving circuit is used to control the first functional unit to be in the first state or the second state.

6. The display substrate according to claim 5, wherein: The first driving circuit includes: a writing subcircuit, a storage subcircuit, a driving transistor, and a detection subcircuit; the first functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer; The write sub-circuit is connected to the first control signal line, the data signal line and the first node respectively, and the data write sub-circuit is used to output a state control signal from the data signal line to the first node in response to a first control signal provided by the first control signal line; The storage subcircuit is connected to the first node and the second node respectively, and the storage subcircuit is used to adjust the potential of the second node according to the potential of the first node, and the second node is connected to the anode of the first functional unit; The gate of the driving transistor is connected to the first node, the first electrode of the driving transistor is connected to the first power signal line, and the second electrode of the driving transistor is connected to the second node; The detection sub-circuit is respectively connected to the first power signal line, the second node and the detection signal line; In which, the state control signal is used to control the driving transistor to be in an on state or an off state; when the driving transistor is in the off state, under the control of the detection sub-circuit and the detection signal line, the first functional unit is in the first state; when the driving transistor is in the on state, under the control of the first power signal line, the first functional unit is in the second state.

7. The display substrate according to claim 6, wherein: The detection subcircuit includes: a first detection subcircuit, a second detection subcircuit and a read transistor; The first detection sub-circuit is connected to the second control signal line, the second node, and the third node respectively, the third node is connected to the detection signal line, and the first detection sub-circuit is configured to output a reverse bias signal from the detection signal line to the second node in response to a second control signal provided by the second control signal line; The gate of the read transistor is connected to the fourth node, the first electrode of the read transistor is connected to the first power signal line, and the fourth node is connected to the second electrode of the drive transistor and the third node respectively; The second detection sub-circuit is respectively connected to the third control signal line, the third node and the second electrode of the read transistor, and the second detection sub-circuit is used to output a test signal provided by the first power signal line and passing through the first electrode and the second electrode of the read transistor to the third node in response to a third control signal provided by the third control signal line.

8. The display substrate according to claim 7, wherein: The first detection subcircuit includes: a first transistor; A gate of the first transistor is connected to the second control signal line, a first electrode of the first transistor is connected to the second node, and a second electrode of the first transistor is connected to the third node.

9. The display substrate according to claim 7, wherein: The second detection sub-circuit includes: a second transistor; A gate of the second transistor is connected to the third control signal line, a first electrode of the second transistor is connected to the third node, and a second electrode of the second transistor is connected to the second electrode of the read transistor.

10. The display substrate according to claim 7, wherein: The writing sub-circuit includes: a third transistor; A gate of the third transistor is connected to the first control signal line, a first electrode of the third transistor is connected to the data signal line, and a second electrode of the third transistor is connected to the first node.

11. The display substrate according to claim 7, wherein: The storage sub-circuit includes: a first capacitor; One end of the first capacitor is connected to the first node, and the other end of the first capacitor is connected to the second node.

12. The display substrate according to any one of claims 5 to 11, characterized in that: The driving circuit layer further includes a second driving circuit electrically connected to the second functional unit, the second driving circuit being used to control the second functional unit to be in the second state; the second functional unit includes an anode and a cathode arranged opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer; The second driving circuit includes: a fourth transistor, a second storage capacitor and a fifth transistor; The gate of the fourth transistor is connected to the first control signal line, the first electrode of the fourth transistor is electrically connected to the data signal line, and the second electrode of the fourth transistor is connected to the fifth node; One end of the second capacitor is connected to the fifth node, the other end of the second capacitor is connected to the sixth node, and the sixth node is connected to the anode of the second functional unit; A gate of the fifth transistor is connected to the fifth node, a first electrode of the fifth transistor is connected to the first power signal line, and a second electrode of the fifth transistor is connected to the sixth node.

13. The display substrate according to claim 12, wherein: The plurality of first driving circuits and the plurality of second driving circuits in the backplane are arranged in an array; the backplane further comprises: a plurality of data signal lines, a plurality of first control signal lines, a plurality of second control signal lines, a plurality of third control signal lines, and a plurality of detection signal lines; the data signal lines and the detection signal lines are arranged in parallel, the first control signal lines, the second control signal lines, and the third control signal lines are arranged in parallel, and an extension direction of the data signal lines intersects an extension direction of the first control signal lines; Among them, the same data signal line is electrically connected to the first drive circuit and / or the second drive circuit arranged in a column; the same first control signal line is electrically connected to the first drive circuit and / or the second drive circuit arranged in a row; the same second control signal line and the same third control signal line are both electrically connected to the first drive circuits arranged in a row; the same detection signal line is electrically connected to the first drive circuits arranged in a column.

14. The display substrate according to any one of claims 5 to 11, characterized in that: The second functional unit also has the first state, and when the second functional unit is in the first state, the second functional unit is used to detect the target light; The driving circuit layer further includes a second driving circuit electrically connected to the second functional unit, and the second driving circuit is used to control the second functional unit to be in the first state or the second state.

15. The display substrate according to claim 14, wherein: The plurality of first driving circuits and the plurality of second driving circuits in the backplane are arranged in an array; the backplane further comprises: a plurality of data signal lines, a plurality of first control signal lines, a plurality of second control signal lines, a plurality of third control signal lines, and a plurality of detection signal lines; the data signal lines and the detection signal lines are arranged in parallel, the first control signal lines, the second control signal lines, and the third control signal lines are arranged in parallel, and an extension direction of the data signal lines intersects an extension direction of the first control signal lines; In which, the same data signal line and the same detection signal line are electrically connected to the first drive circuit and / or the second drive circuit arranged in a column; the same first control signal line, the same second control signal line and the same third control signal line are electrically connected to the first drive circuit and / or the second drive circuit arranged in a row.

16. The display substrate according to any one of claims 5 to 11, 13 and 15, characterized in that: The first functional unit and the second functional unit each include an anode and a cathode disposed opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer; The backplane also includes: a first power signal line and a second power signal line, the anode of the first functional unit and the anode of the second functional unit are both electrically connected to the first power signal line, and the cathode of the first functional unit and the cathode of the second functional unit are both electrically connected to the second power signal line.

17. The display substrate according to claim 1, wherein The plurality of the first functional units and the plurality of the second functional units are arranged in an array into a plurality of rows and a plurality of columns; The first functional unit and the second functional unit each include an anode and a cathode disposed opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer; The backplane includes: a plurality of first detection lines, a plurality of second detection lines, a plurality of first driving lines and a plurality of a second drive line; One of the first detection lines is electrically connected to the anodes of each first functional unit in a row of the first functional units, and one of the second detection line is electrically connected to the cathodes of each first functional unit in a column of the first functional units; One first driving line is electrically connected to the anode of each second functional unit in a row of the second functional units, and one second driving line is electrically connected to the cathode of each second functional unit in a column of the second functional units.

18. The display substrate according to claim 17, wherein: The first detection line extends in parallel with the first driving line, and the first detection line and the first driving line are arranged in the same layer; the second detection line extends in parallel with the second driving line, and the second detection line and the second driving line are arranged in the same layer.

19. The display substrate according to claim 1, wherein The plurality of the first functional units and the plurality of the second functional units are arranged in an array into a plurality of rows and a plurality of columns; The first functional unit and the second functional unit each include an anode and a cathode disposed opposite to each other, the anode being located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode being located on a side of the second semiconductor layer away from the multi-quantum well layer; The backplane includes: a plurality of first detection lines, a plurality of second detection lines, a plurality of first driving lines and a plurality of second driving lines; One of the first detection lines is electrically connected to the anodes of each first functional unit in a column of the first functional units, and one of the second detection lines is electrically connected to the cathodes of each first functional unit in a row of the first functional units; One first driving line is electrically connected to the anode of each second functional unit in a row of the second functional units, and one second driving line is electrically connected to the cathode of each second functional unit in a column of the second functional units.

20. The display substrate according to claim 19, wherein The extending direction of the first detection line is parallel to the extending direction of the second driving line, and the first detection line and the second driving line are arranged in the same layer; the extending direction of the second detection line is parallel to the extending direction of the first driving line, and the second detection line and the first driving line are arranged in the same layer.

21. The display substrate according to any one of claims 17 to 20, characterized in that: Multiple columns of the first functional units and multiple columns of the second functional units are arranged alternately, and / or, A plurality of rows of the first functional units and a plurality of rows of the second functional units are arranged alternately.

22. The display substrate according to any one of claims 1-3, 5-11, 13, 15, and 17-20, characterized in that: The target light is a portion of the light emitted by the second functional unit in the second state.

23. The display substrate according to claim 22, wherein: The target light is the light reflected by an external object among the light emitted by the second functional unit in the second state, and / or, The target light is a light with a large viewing angle among the lights emitted by the second functional unit in the second state.

24. The display substrate according to claim 22, wherein: The target light is the light reflected back by an external object in the light emitted by the second functional unit in the second state, and the external object includes a fingerprint.

25. The display substrate according to claim 23 or 24, characterized in that: At least part of the multi-quantum well layer in the second functional unit is used to emit light of a first color, and the material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits light of the first color; Alternatively, at least part of the multi-quantum well layer in the second functional unit is used to emit light of a second color, and the material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits light of the first color or light of the second color; Alternatively, at least part of the multi-quantum well layer in the second functional unit is used to emit a third color light, and the material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits the first color light, the second color light, or the third color light; The wavelength of the first color light is greater than the wavelength of the second color light. The wavelength of the color light is greater than the wavelength of the third color light.

26. The display substrate according to any one of claims 1-3, 5-11, 13, 15, and 17-20, characterized in that: The target light is light incident from the outside.

27. The display substrate according to claim 26, wherein: The light incident from the outside includes: external ambient light and / or laser.

28. The display substrate according to any one of claims 1-3, 5-11, 13, 15, and 17-20, characterized in that: The material of the multi-quantum well layer in the first functional unit is the multi-quantum well material in a red light emitting diode.

29. The display substrate according to any one of claims 1-3, 5-11, 13, 15, and 17-20, characterized in that: The second functional unit includes a second functional unit that emits red light when in the second state; The material of the multi-quantum well layer in the first functional unit is the same as the material of the multi-quantum well layer in the second functional unit that emits red light when in the second state.

30. The display substrate according to any one of claims 1-3, 5-11, 13, 15, and 17-20, characterized in that: The first functional unit includes an anode and a cathode arranged opposite to each other, the anode is located on a side of the first semiconductor layer away from the multi-quantum well layer, and the cathode is located on a side of the second semiconductor layer away from the multi-quantum well layer; the display substrate includes a plurality of the first functional units, and the plurality of the first functional units are divided into at least one group of first functional units; The display substrate further includes: at least one first applying electrode corresponding one-to-one to the at least one group of first functional units, and at least one second applying electrode corresponding one-to-one to the at least one group of first functional units; In a group of the first functional units, the anode of each of the first functional units is used to be connected to a corresponding first application electrode, and the cathode of each of the first functional units is used to be connected to a corresponding second application electrode.

31. The display substrate according to claim 30, wherein: A group of the first functional units can be arranged in at least two rows; The first applying electrode includes: a first electrode body, and at least two first strip electrodes corresponding one-to-one to at least two rows of the first functional units, wherein ends of the first strip electrodes are connected to the first electrode body, and the first strip electrodes are connected to the anodes of the respective first functional units in the corresponding row of the first functional units; The second applying electrode includes: a second electrode body, and at least two second strip electrodes corresponding one-to-one to at least two rows of the first functional units, ends of the second strip electrodes are connected to the second electrode body, and the second strip electrodes are connected to the cathodes of the respective first functional units in the corresponding row of the first functional units; The at least two first strip electrodes and the at least two second strip electrodes are distributed between the first electrode body and the second electrode body, and the at least two first strip electrodes and the at least two second strip electrodes are arranged alternately.

32. A method for driving a display substrate, characterized in that: The driving method is applied to the display substrate according to any one of claims 7 to 11, and the method comprises: In a first stage, the potential of the first control signal provided by the first control signal line and the potential of the second control signal provided by the second control signal line are both the first potential, the potential of the third control signal provided by the third control signal line is the second potential, the potential of the state control signal provided by the data signal line and the potential of the reverse bias signal provided by the detection signal line are both the second potential, the write sub-circuit outputs the state control signal to the first node in response to the first control signal, so that the drive transistor is in the off state, and the first detection sub-circuit outputs the reverse bias signal to the second node in response to the second control signal, so that the first functional unit is in the first state; In the second stage, the potential of the first control signal provided by the first control signal line and the potential of the third control signal provided by the third control signal line are both the first potential, the potential of the second control signal provided by the second control signal line is the second potential, and the potential of the state control signal provided by the data signal line is the second potential; the write sub-circuit outputs the state control signal to the first node in response to the first control signal, so that the drive transistor is in the off state; and the second detection sub-circuit outputs the test signal provided by the first power signal line and passing through the first electrode and the second electrode of the read transistor to the detection signal line through the third node in response to the third control signal; In the third stage, the potential of the first control signal provided by the first control signal line is the first potential, the potential of the second control signal provided by the second control signal line and the potential of the third control signal provided by the third control signal line are both the second potential, the potential of the state control signal provided by the data signal line is the first potential, and the write sub-circuit outputs the state control signal to the first node in response to the first control signal, so that the driving transistor is in the on state, and the first power signal line outputs the first power signal to the fourth node through the driving transistor, so that the first functional unit is in the second state.

33. A method for driving a display substrate, characterized in that: The driving method is applied to the display substrate according to any one of claims 17 to 21, and the method comprises: During the stage in which the display substrate detects the target light, detection drive signals are applied to the multiple second detection lines in sequence, and in the process of applying the detection drive signal to any one of the second detection lines, the detection signals transmitted by the multiple first detection signal lines are obtained to determine the position of the first functional unit that receives the target light and the intensity of the target light irradiated to the first functional unit.

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